package com.atguigu.springcloud.alibaba.controller;

import com.alibaba.csp.sentinel.annotation.SentinelResource;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.atguigu.springcloud.alibaba.entities.CommonResult;
import com.atguigu.springcloud.alibaba.entities.Payment;
import com.atguigu.springcloud.alibaba.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

/**
 * 解决服务熔断的
 */
@RestController
@Slf4j
public class CircleBreakerController {

    public static final String SERVICE_URL = "http://nacos-payment-provider";

    @Resource
    private RestTemplate restTemplate;

    @RequestMapping("/consumer/fallback/{id}")
//    @SentinelResource(value = "fallback") // 没有配置
//    @SentinelResource(value = "fallback",fallback = "handlerFallback")// fallback 只负责业务异常
//    @SentinelResource(value = "fallback",blockHandler = "blockHandler")// blockHandler 只负责 sentinel 控制台配置违规
    @SentinelResource(value = "fallback",fallback = "handlerFallback",blockHandler = "blockHandler",
    exceptionsToIgnore = {IllegalArgumentException.class}) // exceptionsToIgnore假入报该异常，不再有fallback方法兜底，没有降级效果
    public CommonResult<Payment> fallback(@PathVariable Long id){
        CommonResult<Payment> result = restTemplate.getForObject(SERVICE_URL + "/paymentSQL/" + id,CommonResult.class, id);
        if (id == 4){
            throw new IllegalArgumentException("IllegalArgumentException,非法参数异常...");
        }else if(result.getData() == null){
            throw new NullPointerException("NullPointerException, 该ID 没有对应记录，空指针异常");
        }
        return result;
    }
    // 兜底方法 本例是fallback
    public CommonResult handlerFallback(@PathVariable Long id, Throwable e){
        Payment payment = new Payment(id, "null");
        return new CommonResult<>(444,"兜底异常handlerFallback，exception内容"+ e.getMessage(),payment);
    }
//    本例 blockHandler
    public CommonResult blockHandler(@PathVariable Long id, BlockException blockException){
        Payment payment = new Payment(id, "null");
        return new CommonResult(445, "blockHandler-sentinel 限流，无此流水：blockException " +
                blockException.getClass().getCanonicalName());
    }

    // -========= OpenFeign
    @Resource
    private PaymentService paymentService;

    @GetMapping(value = "/consumer/paymentSQL/{id}")
    public CommonResult<Payment> paymentSQL(@PathVariable("id") Long id){
        return paymentService.paymentSQL(id);
    }

}
